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Vitamin D Testing (25-Hydroxy)

The Vitamin D test is also known as a Ergocalciferol (Vitamin D2), Cholecalciferol (Vitamin D3), Calcidiol or Calcitriol test.

All you need to know about testing Vitamin D levels with a laboratory test

  • What is the Vitamin D test for?
  • How to test Vitamin D?
  • What if Vitamin D results are high?
  • What if Vitamin D results are low?
  • Who should take the Vitamins & Minerals Complete Blood test?

Vitamin D Testing UK Statistics 2026

Icon For Vitamin D
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24.4% of people tested have Vitamin D levels which are too low.

And 2.0% have levels that are too high.

74.4

Low
< 50

Normal
50 - 200

High
200 +

The average Vitamin D result is 74.4 nmol/L
Note what is normal for you may differ for your age and sex.

Are you in the 73.6% with normal results?
Get Tested ›

What Is The Vitamin D Test For?

Vitamin D is an essential vitamin, mostly produced in the skin by sunlight (up to 90%) although it is also absorbed from food & supplements.

Its main role is regulating how the body absorbs calcium, phosphate and magnesium from the gut.

Correct levels of these minerals are vital for healthy bone growth.

How To Test Vitamin D

By buying a laboratory test kit with professional nurse or clinic collection, you can accurately measure Vitamin D for total reassurance.

Professional analysis in an accredited laboratory ensures rapid result delivery.

The Vitall Vitamins & Minerals Complete nurse or clinic test kit includes a Vitamin D test and is available for just £99.00.

Tests which include a Vitamin D test:

Health is in your hands
Health is in your hands
Take Control Of Your Health | Home Blood Testing Services

Vitamins & Minerals Complete Test Kit

Vitamins & Minerals Complete test kit
Vitamins & Minerals Complete Home Test Kit UK

Vitamins & Minerals Complete Test Kit

Fully identify & optimise nutritional deficiencies

£99.00

View Full Details ›
Health is in your hands
Health is in your hands
Take Control Of Your Health | Home Blood Testing Services

Bone Health (Osteoporosis) Test Kit

Bone Health (Osteoporosis) test kit
Bone Health (Osteoporosis) Home Test Kit UK

Bone Health (Osteoporosis) Test Kit

Assess essential minerals, protein and vitamins required for healthy bones

£99.00

View Full Details ›
Health is in your hands
Health is in your hands
Take Control Of Your Health | Home Blood Testing Services

Bone Health Advanced (DPD) Test Kit

Bone Health Advanced (DPD) test kit
Bone Health Advanced (DPD) Home Test Kit UK

Bone Health Advanced (DPD) Test Kit

Assess the rate of bone breakdown and essential minerals, proteins and vitamins

£169.00

View Full Details ›

What if Vitamin D Results Are High?

High vitamin D levels most commonly occur due to excessive supplementation rather than natural exposure.

When high vitamin D occurs alongside high calcium, it can be associated with damage to blood vessels, kidneys, and other organs.

Vitamin D supplementation is often discontinued when levels are high.

What if Vitamin D Results Are Low?

Low vitamin D is most commonly linked to limited sunlight exposure. It can also occur when vitamin D is poorly absorbed from food, including with some gastrointestinal diseases.

Related factors that are often considered alongside a low vitamin D result include parathyroid hormone levels, kidney function, use of certain medications, and whether someone has a higher fracture risk.

Understanding the cause of deficiency is important. NICE guidance describes treatment of vitamin D deficiency using fixed high doses of a vitamin D supplement for 6–10 weeks, followed by lifelong maintenance. More information is available here.

This result is commonly reviewed further to clarify the underlying cause and to guide an appropriate approach to treatment.

Who Should Take This Test?

Measure your Vitamin D levels and fully identify & optimise nutritional deficiencies with a Vitamins & Minerals Complete nurse or clinic finger-prick bloodtest kit

You get the convenient testing with the reassurance of professional clinical analysis. Your results are delivered quickly & securely online.

This Vitamins & Minerals Complete Test is advised if you:

  • want the convenience of home testing without waiting for a GP appointment;
  • need a high quality, clinically accredited test done in a professional clinical laboratory.

Other Biomarkers Often Tested With Vitamin D

Urine, swab or bood test. This test is available to buy online Adjusted Calcium
Urine, swab or bood test. This test is available to buy online Albumin
Urine, swab or bood test. This test is available to buy online Calcium
Urine, swab or bood test. This test is available to buy online Ferritin (Iron)
Urine, swab or bood test. This test is available to buy online Magnesium
Urine, swab or bood test. This test is available to buy online Vitamin B12 (Active)
Urine, swab or bood test. This test is available to buy online Vitamin B9
Urine, swab or bood test. This test is available to buy online Vitamin D

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